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A kind of method for preparing high temperature resistant graphite-hastelloy N alloy joint

A joint method and high temperature resistance technology, which is applied in the direction of manufacturing tools, welding equipment, metal processing equipment, etc., can solve the problems of weak resistance to neutron radiation and poor joint stability, and achieve strong resistance to neutron radiation and low cost. Low, excellent mechanical properties and the effect of stabilizing energy

Active Publication Date: 2018-08-17
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When conventional silver or gold-based solder is used to connect graphite and Hastelloy N alloy, due to the weak resistance to neutron radiation of this type of solder, the stability of the joint is poor under strong irradiation conditions

Method used

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  • A kind of method for preparing high temperature resistant graphite-hastelloy N alloy joint
  • A kind of method for preparing high temperature resistant graphite-hastelloy N alloy joint

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for preparing high-temperature-resistant graphite-Hastelloy N alloy joint proposed by the present invention, graphite, titanium foil and Hastelloy N alloy are bonded sequentially with 502 glue, then heated in a vacuum brazing furnace, and graphite / Hastelloy N alloy is obtained after cooling. Hastelloy N alloy fittings.

Embodiment 2

[0027] A kind of method for preparing high temperature resistant graphite-Hastelloy N alloy joint that the present invention proposes, concrete steps are as follows:

[0028] 1) Put the Hastelloy N alloy and graphite into an ultrasonic cleaning machine filled with acetone for cleaning, then use 400#, 600#, 1000#, 1500# sandpaper to polish the surface to be connected, and then polish;

[0029] 2) Graphite, titanium foil with a thickness of 0.15mm and a purity of 99.99%, and Hastelloy N alloy are bonded with 502 glue in sequence, then placed in a vacuum brazing furnace and heated to 350°C, kept for 25min, and then heated to 940°C ℃, hold for 8 minutes, then heat to 1100°C, hold for 5 minutes, then lower the furnace temperature to 300°C at a rate of 8°C / min, and then cool to room temperature with the furnace to obtain graphite / Hastelloy N alloy joints.

Embodiment 3

[0031] A kind of method for preparing high temperature resistant graphite-Hastelloy N alloy joint that the present invention proposes, concrete steps are as follows:

[0032] 1) Put the Hastelloy N alloy and graphite into an ultrasonic cleaning machine filled with acetone for cleaning, then use 400#, 600#, 1000#, 1500# sandpaper to polish the surface to be connected, and then polish;

[0033] 2) Graphite, titanium foil with a thickness of 0.05mm and a purity of 99.99%, and Hastelloy N alloy are bonded with 502 glue in sequence, then placed in a vacuum brazing furnace and heated to 250°C, kept for 28min, and then heated to 920°C ℃, hold for 12 minutes, then heat to 980°C, hold for 15 minutes, then lower the furnace temperature to 300°C at a rate of 4°C / min, and then cool to room temperature with the furnace to obtain graphite / Hastelloy N alloy joints.

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Abstract

Disclosed is a method for manufacturing a high-temperature-resistant graphite-Hastelloy N alloy connector. The method comprises the steps that graphite, titanium foil and Hastelloy N alloy are bonded with 502 glue in sequence, and then are placed in a vacuum brazing furnace to be heated, and the graphite / Hastelloy N alloy connector is obtained after the product is cooled. The method is low in cost and easy to operate, original structures of base materials are not damaged, and the connector has excellent mechanical properties and stability at the working temperature, namely, about 700DEG C, of a molten salt reactor. The method provides theoretical guidance and technical support for construction of critical components of the molten salt reactor, and promotes the development and application of the molten salt reactor.

Description

technical field [0001] The invention relates to the field of brazing technology, and relates to a method for preparing a high-temperature-resistant graphite-Hastelloy N alloy joint, in particular to a method for obtaining a graphite / Hastelloy N alloy joint applied in a high-temperature environment (700°C) by using a titanium-nickel contact reaction method. Background technique [0002] Molten salt reactor, as one of the candidate reactor types of the fourth generation nuclear reactor, has attracted extensive attention due to its advantages such as sustainable utilization of nuclear fuel, high heat conversion efficiency, and outstanding inherent safety. In 2011, the molten salt reactor was approved as one of the first batch of "future advanced nuclear fission" strategic pilot technology projects of the Chinese Academy of Sciences to start implementation. The U.S. government also approved the restart of the high-temperature molten salt reactor project in 2015. [0003] As a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K1/008B23K1/19B23K1/20
CPCB23K1/008B23K1/19B23K1/20B23K2103/18
Inventor 贺艳明沈寒旸杨建国杨学顺谢浩王丽梅谢志刚高增梁
Owner ZHEJIANG UNIV OF TECH